Turn-on Fluorescence Detection of Acetic Acid in Wine Using a Uranyl–Organic Framework

The content of acetic acid is closely related to the quality of wines. Traditional methods for the detection of acetic acid in wine are generally tedious and time-consuming; therefore, it is necessary to develop a quick and convenient detection method. A new three-dimensional uranyl–organic framework named HNU-47 was rationally synthesized by using UO22+ and a TPE (tetraphenylethylene) core organic ligand. HNU-47 displays a turn-on fluorescence response toward acetic acid. The sensing mechanism is attributed to the acetic acid molecules forming hydrogen bonds with the uncoordinated carboxylate groups in the TPE core organic ligand, thus restricting the intramolecular rotation of the TPE core to achieve turn-on fluorescence. A good agreement between test results and standard methods for the determination of acetic acid in wines proves the accuracy and applicability of this contribution, which provides a viable candidate for practical applications.